"Composite API" - How do I tie responses to the request

"Composite API" - How do I tie responses to the request

In the composite API, I see the ability to batch requests, and tag then with ids ("sub_request_id": 1). In the batch response, I do not see a reference to the sub_request_id.  How do I tie a response to the specific request in the case?
I see the ability to form a more complex query, but if I just send 5 unrelated queries, how do I tie the responses to the sent queries?